Thanks guys.
The lens had an LPS filter on the front, and was fitted with a dew
strap, as was the 70-200mm for the second shot. There was no dew
on the front.
The image looked the same when looking through the view finder, so
I don't think it comes down to pixel size. I reckon I may have a bad
copy of the lens. Strange though, as my terrestrial macro shots look
fine. Unfortunately I bought this lens second hand, which I normally
don't do. That'll learn me!
I might give it another try stopped down to f/5.6, but I'm not holding
much hope.
Cheers,
Jason.
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